Hello BartE
Thanks so much for quick replay. I have done your instructions, but now I have a lot of error messages, start with:
Dimmer_net_10:78: error: 'setLedLevel' was not declared in this scope

    setLedLevel(id);

If I delete all strings, wich make problems, I can compile, but the sketch don´t work.

@BartE
Hello, I am happy, to found this sketch, because he has exactly the functions, which I need.
After little issues I have compiled it with Arduino 1.6.7 and Mysensors 1.4.2.
But now always the LEDs are on and the switches are without function. I don't have any home automation controller, only the LED at pin 6 and the switch at pin 4. With other simple sketches the hardware works fine.
My question: It is able to use this sketch without homecontroller or radio (NRF24L01)as stand alone solution only with single buttons?
And if not, which changes I have to do?
Thanks for your help.